Balanced slide-valve



Patented Oct. 1. 1889.

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W. A. 8; J. J. VREELAND. BALANCED SLIDE VALVE.

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ILLIAM A. VREELAND AND JOHN J. VREELAND, OF CHICAGO, ILLINOIS.

BALANCED SLIDE-VALVE.

SPECIFICATION formingpart of Letters Patent No. 411,911, dated October 1, 1889.

Application filed January 28, 1889- Serial No. 297 ,862. (No model.)

To all whom it may concern.-

Be it known that we, \VILLIAM A. VREE- LAND and JoHN J. VREELAND, citizens of the United States, and residents of Chicago, in the county of (look and State of Illinois, have inven ted certain new and useful Improvements in Steam-Balanced Slide-Valves; and we do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, ref erence being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

Figure l of the drawings is a representation of a central vertical section of this invention. Fig. 2 is a top view of the valve.

This invention has relation to balanced slide-valves for steam-engines; and it consists in the construction and novel combina tion of devices, all as hereinafter set forth.

In the accompanying drawings, the letterA designates the steam-chest, and B the steamchest cover.

0 represents the valve, adapted to reciprocats on the ported bottom of the steam-chest, and D the valve-rod, connected to said valve at e.

E is an annular extension of said valve bolted to the body thereof, as indicated at ct, and provided with an exterior annular flange I), under which are perforations (3, leading from the annular way (Z bet-ween the flange Z) of the valve-extension and the interior annular flange 67. of the follower F to the interior of the valve, forming vents for said way, which is liable in time to take steam through the packings. This follower is of annular form and is applied on the outside of the annular extension E of the valve, which forms a guide therefor. The lower portion of the follower is of larger diameter than the upper portion, and said follower is provided with a bearing-piece G, which is designed to move in contact with the valve-chest cover; and it is also provided with a ring II, which is formed with a threaded flange f to engage a thread of the follower, and said ring is de-' signed to form the lower wall of the packingchamber g below the flange d. The upper wall of the packing-chamber it, above the flange b, is formed by the cover -plate K, which is provided with a threaded lip k, to engage an interior thread of the annular e3:- tension E of the valve. The follower is free to move upward and is held up against the cover of the steam-chest by the steam-pressure, the parts of the follower which react against the upward pressure of the steam be ing of larger area than the parts of said follower which react against downward pressure.

The packings between the valve and fol lower are madevery secure, that of the lower packing-chamber g in the follower facing in ward to engage the outer wall of the valveextension, while the packing of the chamber it above faces outward to engage the inner wall of the follower. Should the packings in the course of 'time leak, the steam entering the way cl is relieved through the perforations c, communicating with the exhaustchamber.

Having described this invention, what we claim, and desire to secure by Letters Patent, 1s-

1. The balanced slide-valve provided with a hollow extension having steam-passages, in combination with the follower encircling said valve-extension and having between itself and said extension at packing-chamber the upper wall of which is formed by an inner flange upon the follower about midway the height of said follower, said flange forming the bottom of a steam-space communicating with said steam-passages of the valve-extension, substantially as set forth.

2. The balanced slide-valve provided with a hollow extension having steam-passages, and a covering-plate connected thereto, in combination with the follower encircling said valve-extension and having connected to its lower end a ring, and provided with a steamspace communicating with said steam-passages, said valve-extension having a flange forming with the valve-covering plate the bottom and top walls of a packing-chamber, and said follower having a flange forming with an inwardly-projecting flange of said ring the bottom and top Walls of an addi- In testimony whereof we affix our signatures in presence of two Witnesses.

W'M. A. VREELAND.

5 tional packing-Chamber, intermediateiy of JOHN J. VREELAND.

which packing whambers is arranged the Witnesses: aforesaid steam -space, substantially as set 4 A. STARK, forth.

.1. W. HALPIN. 

